Copper Nanoclusters Loaded on SA/PVA Composite Films for Sensitive Detection of Trace Water in Organic Solvent

Abstract Copper nanoclusters (CuNCs), a new type of fluorescent material, have attracted extensive attention due to their excellent fluorescence properties and stability. In this paper, orange–red organic fluorescent CuNCs are prepared using reduced glutathione both as a template and reducing agent. CuNCs are then doped into a polymer matrix of alginate and polyvinyl alcohol using the aggregation‐induced emission enhancement effect to produce a kind of easy to use fluorescent composite films. The fluorescent composite films can realize the specific detection of trace water in the organic environment, and the detection limit can reach 0.0025% (volume ratio). Compared with the pure exposed CuNCs, the fluorescence intensity is greatly improved, and more importantly, the fluorescent composite films can be used repeatedly, saving resources and environmental protection.